Start higher than down near the deck??

Seriously though, consider a "slow roll" condition in your radio where the aileron, rudder and elevator rates are appropriate for what you need. At high speed, too much throw can really make a smooth slow roll next to impossible although at 200mph I doubt you be doing the traditional ~5 sec slow roll.

Four point rolls are a good starting point, master that and you just have to blend the points together. Also it's a bad habit (but a safe one), if you learn to do it a particular way as all my slow and point rolls (flying left or right) start with me rolling towards myself, looking at the top of the plane at the first point. That way the first rudder input is always opposite to the aileron. However my inverted to inverted rolls are done rolling away from myself (first rudder same as aileron), the common denominator being that I'm always looking at the top of the plane during the first 1/2 roll.

The golden rule is practice 3 mistakes high, and keep it fun.